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EMAK
Century Club
Joined: 26 Nov 2006
Posts: 572
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 Posted: Fri Jan 26, 2007 6:51 pm Post subject: Uteroplacental bloos flow |
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Maternal respiratory acidosis is characteristically associated with reduction in uteroplacental blood flow.....
I think it is True but I don't remember why??
can any one remember??. |
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rpwalavalkar
Teale Fenning Administrator
Joined: 20 Jul 2006
Posts: 966
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| Posted: Fri Jan 26, 2007 9:09 pm Post subject: |
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i'll say false.....
acidosis  increases respiratory drive, to wash away excess CO2 increased cardiac output increase peripheral circulation placenta is a peripheraal organ in a pregnant woman increased blood supply.
infact found this article  ( no human studies available )
DD Buss, GE Bisgard, CA Rawlings, and JH Rankin. Uteroplacental blood flow during alkalosis in the sheep. Am J Physiol 228: 1497-1500, 1975.....
Alkalosis, defined for this study as an arterial pH of 7.60 or greater. The rise in pH was unaccompanied by significant changes in systemic arterial blood pressure and cardiac output, while maternal arterial Pco2 rose slightly from control levels. Cotyledonary blood flow declined from a control value of 1,177 ml/min to 1,025 ml/min during alkalosis. This decline of 13 percent in cotyledonary blood flow is significant (P smaller than 0.002). Blood flow to the remaining uterine tissue, or noncotyledonary uterus, did not change with alkalosis.
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Dr Miss. Raj Walavalkar MBBS MRCOG
TealeFenning Administrator
SR O&G Wessex Region |
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EMAK
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Joined: 26 Nov 2006
Posts: 572
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| Posted: Sat Jan 27, 2007 1:39 pm Post subject: |
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| May be if there is respiratory Alkalosis, the kidney will conserve more H+ to compensate and this will not affect Blood flow.... |
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Abik
Century Club
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Location: Poole
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| Posted: Sat Jan 27, 2007 2:40 pm Post subject: |
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I would be tempted to say true.
It doesn't ask if it CAUSES reduced blood flow, just if it is associated.
A maternal respiratory acidosis is likely to be associated with severe maternal disease and this is often associated with impaired uterine blood flow. |
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Nick Raine-Fenning
Course Director
Joined: 27 May 2006
Posts: 1852
Location: Nottingham
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| Posted: Sat Jan 27, 2007 5:05 pm Post subject: Re: Uteroplacental bloos flow |
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| EMAK wrote: | | Maternal respiratory acidosis is characteristically associated with reduction in uteroplacental blood flow..... |
I think you are determined to ask every single question from the Past Paper book if it kills you
Respiratory acidosis = respiratory failure
Simply they are not blowing off carbon dioxide.
Does respiratory failure impair uteroplacental flow? Not sure - I doubt it does acutely but maybe in the chronic state but by then there would be metabolic accommodation.
My gut feeling is it does not characterisitically reduce uteroplacental flow.
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"Teale Fenning Medical Education" delivering evidence-based, exam-orientated learning since 1997 |
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